Financing Receivables - Credit Quality - Commercial Mortgage Loans by LTV Ratio and Year of Origination (Details) - USD ($) $ in Millions	9 Months Ended
Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Amortized cost basis by year of origination and loan-to-value ratio
Loan write-offs	$ 6	$ 3
Commercial Loans
Amortized cost basis by year of origination and loan-to-value ratio
Loan write-offs	3	$ 2
Commercial Loans \| Commercial mortgage loans
Amortized cost basis by year of origination and loan-to-value ratio
Year 1	145		$ 77
Year 2	76		110
Year 3	106		188
Year 4	182		109
Year 5	107		203
Prior	1,271		1,145
Total	1,887		1,832
Loan write-offs	0
Commercial Loans \| Commercial mortgage loans \| Greater than 100 Percent
Amortized cost basis by year of origination and loan-to-value ratio
Year 1	0		0
Year 2	0		0
Year 3	0		0
Year 4	0		0
Year 5	0		2
Prior	17		22
Total	17		24
Commercial Loans \| Commercial mortgage loans \| 80 to 100 Percent
Amortized cost basis by year of origination and loan-to-value ratio
Year 1	0		0
Year 2	0		5
Year 3	0		0
Year 4	0		2
Year 5	10		11
Prior	51		50
Total	61		68
Commercial Loans \| Commercial mortgage loans \| 60 to 80 Percent
Amortized cost basis by year of origination and loan-to-value ratio
Year 1	66		59
Year 2	44		26
Year 3	18		6
Year 4	9		14
Year 5	6		40
Prior	140		106
Total	283		251
Commercial Loans \| Commercial mortgage loans \| 40 to 60 Percent
Amortized cost basis by year of origination and loan-to-value ratio
Year 1	68		8
Year 2	22		47
Year 3	39		133
Year 4	73		53
Year 5	41		70
Prior	355		348
Total	598		659
Commercial Loans \| Commercial mortgage loans \| Less than 40 Percent
Amortized cost basis by year of origination and loan-to-value ratio
Year 1	11		10
Year 2	10		32
Year 3	49		49
Year 4	100		40
Year 5	50		80
Prior	708		619
Total	$ 928		$ 830

Amount, excluding accrued interest, of decrease in allowance for credit loss on financing receivable from writeoff. Excludes net investment in lease.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-6

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 326
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